Compound of acetyl cellulose and process.



Unirm) STATES PATENT OFFICE.-

WILLIAM GODSON LINDSAY, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE CELLULOIDCOMPANY, A CORPORATION OF NEW JERSEY. I

OOINIPOUN D 01? ACETYL OELLULOSE AND PROCESS.

Specification of Letters Patent. Patented May 7 1 918 No Drawing.Original. application filed January 29. 1914, Serial No..81 5,11 0.fPatent No. 1,199,799, dated October 3, 1916. Divided and thisapplication filed September 1, 1916. Serial No. 118,001.

To all whom it may concern Be it known that I, VVILLIAM G. LINDSAY, acitizen of the United States, residing at Newark, in the county of Essexand State of New Jersey, have invented certain. new and usefulImprovements in Compounds of Acetyl Cellulose and Processes, of whichthe following is a. full, clear, and exact specification.

This invention is especially useful in its application to films forphotographic punposes, although such application may be e xtended to theso-called solid. compounds.

The object of the invention is to impart permanent flexibility andtoughness of a high degree to products resulting from the admixture ofan organic derivative of cel--' lulose such as acetyl cellulose withvarious solvents therefor. l

I have discovered that the liquid monohydroxy aliphatic alcohols havingmore than two carbon atoms, such as 'propyl, butyl, amyl, etc, alone andin various admixtures, have the property of imparting to such products ahigh degree of' permanent toughness, flexibility and elasticity withoutimpairing the other desirablecharacteristics. In fact, use of suchalcohols in conjunction with the usual solvents not only increases theflexibility and elasticity, but the tensile strength as well.

I have discovered that by the use of the liquid monohydroxy aliphaticalcohols having more than two carbon atoms, the characteristics ofdurability, toughness and flexibility are imparted to the film. Thesecharacteristics are not attained by theuse of e1 hyl or methyl alcohol.

As a mixture of the alcohols herein referred to, the ordinary fuse] oilof commerce is a good example. I have found that the ordinary commercialfuse] oil imparts to the acetyl cellulose mixtures herein described thepeculiar and valuable properties claimed by, this invention. Also, whenthe ordinary commercial grade of fusel oil is subjected to fractional.distillation, I find that the diifercnt fractions, either alone or mixedin varying proportions, impart a certain degree of flexibility andelasticity to the finished product. p

In order to carry out my invention, I may proceed as follows: In makinga flowable solution for films or. varnishes or other similar purposes, Itakeone hundred (100) parts of acetyl cellulose by weight and to thisacetyl cellulose dissolved in'a suitable solvent, such, for example, asa mixture of ethylene chlorid and alcohol, I add from ten (10) to forty(40) parts of asolid such as camphor, triphenylphosphate,paratolu0lsulfamid, or the like, and from five (5) to thirty (30) partsof one or more of the alcohols herein specified, as above described. Thesolvent-forthe acetyl cellulose should also act as a solvent for theother specified ingredients.

found in practice that by incorporating the alcohols herein specified bymeans of a suit able solvent, beneficial results are obtained withpractically all varieties. I However, I prefer that variety of'acetylcellulose which is plastic in chldroforin and insoluble in acetone,although I may use with satisfactory results that variety of acetylcellulose which is plastic in chloroform and also soluble in acetone to.the extent of producing a fiowable solution.

In my United States Patent No. 1,027,616 I disclosed the use ofethylenechlorid in combination with ethyl or methyl alcohol, and I find.that to such a mixture in which acetyl cellulose has been dissolved, theaddition of the alcohols herein specified imparts to the productpermanent toughness and flexibility of a high degree. Such a combinationis particularly well adapted for the production of plastic masses.

Having thus described my invention, I declare that what I claim as newand desire to secure by Letters Patent is:

l. A composition of matter containing an acetyl cellulose and calnphor,obtained by dissolving the same in a common solvent, and a liquidmonohydroxy aliphatic alcohol having more than two carbon atoms.

2. A compositionof matter containing an acetyl cellulose plastic inchloroform and cam-phor, obtained by dissolving the same in a commonsolvent, and a liquid monohydroxy aliphatic alcohol having more than twocarbon atoms. 7

3. A composition of matter containin an organic derivative of celluloseand camplior, obtained by dissolving the same in a solvent mixture of achlorinated hydrocarbon and an aliphatic alcohol, and a liquid forimparting toughness and flexibility to the product.

4. A composition of matter containing an organic derivative of celluloseand camphor, obtained by dissolving the same in'a solvent mixture of achlorinated hydrocarbon and an aliphatic alcohol, and a liquidmonohydroxy aliphatic alcohol having more than two carbon atoms. a 5. Acomposition of matter'containing an organic derivative ofcellulos'e-and-camphor, obtained b dissolvingthe same in a solventmixture 0 a chlorinated hydrocarbon and an aliphatic alcohol, and fuseloil.

6. A composition of matter containing alcohol and fusel oil,

. cellulose and camphor in a common solvent,

adding a liquid monohydroxy alcohol having more than two carbon atoms.and drying the same.

8. The process of inaking a composition of matter, which consists indissolving an acetyl cellulose plastic in chloroform and camphor in acommon solvent, adding a liquid monohydroxy alcohol having more than twocarbon atoms, and drying the same.

In testimony whereof I afiix my signature in presence of twowitnesses. H

' WILLIAM GODSON LINDSAY. Witnesses:

ELSIE GREENBERGER, O. GA'LVION.

' Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents;

Washington, D. 0.

